Locking device



Patented July 12, 1932 i ,7 i I I 1,856 684 NIT D STATES ewes error 2 Application fi1ed.May as, 1930, Serial 1%. 457,263, and in Germany s 7, 19,29; f

This invention relates to locking devices inner end of the articulated member occupies o1 the kind in which the bolt or each oftwo the said annular space andiclosely embraces or more bolts is adapted to be moved into the rotatable member. Q 2 and out of its operative position by means In order that myinvention may be clearly 5 of a rotatable member or sprocket to which understoodand readily carried into practi- 55 the bolt or each bolt is indirectly attached' cal eiiect, reference is made in describ in'g the In locking devices of the kind referred to, same to the examples shown in the accompas I as at present constructed, the connection. nying drawing, whereinz' 1 f between the bolt and the rotatable member Figures 1- and2 are sectio'n'al front and side is by means of a controlled guide rod which views respectively of the improved locking 60 being rigid allows of only a very limited devioe'as adapted torthe'simultaneous operdegree of movement of the bolt, since the ation ,ofapair of diametrically oppositebolts. rotatable member in the most favourable Figures 3 and at are views similar to' Fig. case can only be turned through an angle of 2 showing alternative applications of'the 90. Even in this case the cover or casing invention. 2 I of the rotatable member must either be Inthe arrangement shown in Figs. land 2, notched or. otherwise formed to accommothe casing 5, which encloses the rotatable date the guide rod or rods and in some cases member or sprocket .6, is of fiat circular forthis involves a weakening of the whole conmation and: of relatively small diameter. 9 struction. A further disadvantage of these Th sp c et 63S Pi V-ided,-in"this-case,.with W I guide rods lies in the fact that they must two diametrically opposite radial projections necessarily transmit the movement at an an.- 8 t0 h h the inner ends of flat link chains gle to the longitudinal axis of the bolts there- 9 and 10 are pivotally secured, th Other ends by entailing loss of power and a tendency of the chains being attached tothe bolt rods for the guide rods and bolts to bind in their 11 and 12 r sp t vely- I I channels. Guides 13 and 14-are fixed to the casing 5, The obje t of th ent invention i to to guide the chains in their movementsinto obtain a freer and more extended movement and out of the casing. The sprocket is turned ot the bolt or bolts and to reduce the diy me s-0t a handle 15 Or thelike attached mensions of the device so that it can be ap- 0 the squared in 16 on which the sprocket,

plied to a greater variety of uses, including ismounted'. V the doors of high class furniture and th The links of the chain, as seen; in Fig. 1, like. are flat'and have rounded ends which touch A, A locking device of the kindherein reeachot-hen-so that, as the chain bends, the ferred to embodying the present invention r n n l I 0116 h r, and When is characterized in that the movement of the chains are in compression there is-no the rotatable member or sprocket is transwear on the chain rivets thepressure being mitted to the bolt. or to each of several bolt transmitted direct from link to link. It will 0 by means of a guided flexible or articulated h be n h t n h SPr k is rn member which is adapted to act in compress 1n airlock-Wise directionthe' ai are both sion as well as in tension. drawn inwardly, their inner ends passing The said articulatedmember may consist e n the sp ket 6 and the casi g 5- In of a flat linkchain in which adjacent ends this way the bolt rods 11fand'12 are drawn of the links are rounded and always in contowards each otherat the same time and to tact with each other. The said articulated an equal extent. When, however, the sprockmember works in a tubular guide which viret is" turned in. the opposite direction, the tually forms an extension of an annular chains are moved outwardly under compresspace between the rotatable member or Sion the bolt rods being thus moved away 50 sprocket and its casing so that when the rofrom each other.

tatable member is turned in one direction the In the arrangement shown in Fig. '3, "the casing 17, the casing guides 18 and 19 and the interior guides 20 and 21 are arranged in such a way that both chains 22 and 23 are pivotally attached to a single projection 2a and partly guide one another; In this case, with a sprocket 25 of comparatively small diameter, the bolt rods, which in this arrangement move in direction at right angles to each other, can therefore receive a considerable stroke.

Fig. 4 shows a fixrtherappli'cation of the invention in which by means of a single rotatable sprocket three bolt rods 28, 29 and 30 can be simultaneously operated. The bends 31 and 32 of the chain 33 show that by a suitable. formation of. the casingguide the bolt rod- 28 may have amore or: less optional position. 1

Erom the foregoing itwill be seen that it is: possible to keep the-dimensions of the sprocket. casing verysmall whilst at the same providing the maximum amount of movement for the bolts even where, as' in Fig. 3, the chains overlap one another. -The sphere of; usefulnessof alocking device ofthe kind. referred to can therefore by meansxof this invention be considerably extended so as to be applicable for use in the case of the doorsof cupboards,.clockworks, switches and the like. V

The arrangement oi the rotatable sprocket also lends itself to; the incorporation therewith of. a cylinder lock;

In; order to make the movement of the chains asfree aspossible in the casingguides so. that thedevice can. even be operatedby means ofa simple key,-the; chain rivets can be provided with roller discs of a slightly larger diameter thanthe ends oithelinks' What I claim is I. In a locking device, a rotatable, substantially. circular element, av radial projection on said. element, a chain hingedat its inner endto said projection, a locking bolt hinged to the. outer'end ofsaid chain, a. substantially circular casing coaxially enclosing saidielemen-t and radially spaced therefrom; to form withsaid. element a curved channel having a width substantially equal-to the radial dimension of said. chain, a: tubular member se cured to said casing and in communication therewith, said member snugly enclosing and guiding said chain and bolt and permitting said chain. to act. in compression, and a guide 7 piece secured within said casing inthe path of: said projection to provide an, abutment 1,sce,osa

ed to snugly enclose and guide one of said chains'with its bolt and to allow the chain therein to act in compression, and a plurality of' rigid guide pieces secured within said casing to form, together with the inner wall 0t said casing, smooth transitions from said channel to said tubular members, one of said guide pieces forming'an abutment for said projection.

In testimony whereof I affix my signature.

CORNELIS VAN DER LEUN.

therefor and forming, together with the inner wall of said casing, a smooth transition from said channel to said tubular member.

. 2; In alockingdevice, a rotatably, substantially circular element, a radial projection on said element, a plurality of chains hinged at their innerends to radially spaced points of said projection, the inner chain being. adapt- CdZtCl be wound on said element and the outer 

